It is well know that MP4 is a multimedia container file format that can store data that are encoded with various different video and audio codec as below: Why MP4 files fail to play on QuickTime player? An invalid sample description was found in the movie. Any help on the reasons why Quicktime won't play the MP4 movies would be greatly appreciated." When I try and play the movies using Quicktime I get the following error message: The movie could not be opened. mp4 format that for some reason Quicktime player doesn't seem to like. What am I doing wrong? Where should I open the video to play it? itunes or imovie?" When I open quicktime, open file, mp4, there is a picture of the video with no sound and its not playing. I downloaded some mp4 videos and quicktime but cannot get them to play. For Mac users, when you are trying to play some MP4 video with QuickTime player, you will encounter the following problem:
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